What it means
Parivartana means exchange. Two planets sit in each other's signs, so each one stands in the other's home. Tradition reads them as one unit.
The 1st house is you. The 10th is your work and public standing. When their lords swap places, the texts say the two cannot be separated: your work becomes your identity, and your identity shapes your work. A job here is rarely only a job.
This exchange shows up in about 1 chart in 26. The planets do not need to be in the same sign or even look at each other. The swap alone is enough.
If yours passes, ask yourself a plain question. Could you stop doing this work and still feel like yourself?